When Susie brings the macaroons to Doc, the rattlesnake cage is a few inches below her elbow. In the next shot, the cage is a few inches above her elbow.
During the "sick or a busted arm" scene in the Golden Poppy between Suzy and Hazel, the number of ketchup bottles with and without caps changes between shots.
When Mack sits down at the open upright piano and starts playing during the final party scene, none of the hammers - which are clearly visible - move.